Resistive Touch Panels

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Philip Craig
5 years ago
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1 Resistive Touch Panels SMK has a broad repertoire of resistive touch panels to suit all our clients needs. As well as our standard specification models, we have heat-resistant models suitable for outdoor use, high transparency models that boast excellent visibility, models that allow for multi-touch input, and more. Whatever your requirements, we are confident that we have the touch panel you require. Principle of resistive touch panels Film/glass type. The upper electrode consists of a transparent film with "ITO" formed on it and the lower electrode consists of a transparent glass plate with "ITO" formed on it. Input with a pen or finger will make the upper electrode flex and make electrical contact to the lower electrode and then current flows. ITO : Indium tin oxide Coordinates are read by the controller.the point where input has been made will be read by application of voltage to the Y side and by reading the voltage of the X side. Then, voltage is to be applied to the X side before the voltage of the Y side is read at the X side. The voltage value will be output by the controller as a converted coordinate value. Definition of touch panel areas Touch panel cross-section Our touch panels have the four defined areas : A. Insulated area: Electrodes and insulated pat ter ns are laid. Silver printing and adhesive substances are applied. B. View area: Transparent area. C. Active area : Actual touch panel operation performance assurance area. Active area of LCD should be set inside this area. D. Dead area : The area between the insulated area (A) and active area (C). Structurally, the endurance against drawing operations are weak in the dead area; and therefore, please set the input area inside the active area. 10

2 Resistive Touch Panels Technical Term Transparency This is an important element to determine the optical characteristics of touch panels. The transparency of touch panels differs from degree of transparency of the film materials, glass materials and optical film to be used. Widely available film/glass touch panels have a transparency rate of 75% to 88%. 4-wire and 8-wire systems Input reading errors may occur, due to aging of ITO or a silver pattern. 4-wire 8-wire 4 wire type: Adjustment is required by use of exclusive software. 8 wire type: A controller supervises periodically the voltage value from the main electrode and auxiliary electrode, and revise it automatically Linearity Ratio of how much straight drawn lines on a touch panel is seen as curved on display. Curve ratio (mm) / Active area (mm) x100% Newton ring Rainbow-like patterns that appear on touch panel, due to interference, when the top and bottom electrodes are too close or a proper fixed distance is not maintained. Haze Rate of diffused light to the total light transmitrance. The greater this value is, the lower the influence of reflection will be. However, touch panels are often seen blurred. Surface treatment Panel surfaces (input surfaces) can be finished in a glare (clear) or anti-glare type. Anti-smudge A fine matte finish process is applied on the operation surface to prevent the appearance of distracting surface smudges. Tempered glass The lower electrode glass plate can be replaced with chemically tempered glass. The use of tempered glass enables thinner and lighter touch panel without sacrificing the durability of products. A 10.4" panel will be 67% lighter and 71% thinner than standard glass types. High heat resistant This type uses a highly reliable heat resistant materials for a tough operating environment such as an automotive environment. 11

Resistive Touch Panels Film / glass structure These touch panels are constructed using both film and glass. Film is used for the top electrodes, and glass is used for the bottom electrodes.

3 Resistive Touch Panels Film / glass structure These touch panels are constructed using both film and glass. Film is used for the top electrodes, and glass is used for the bottom electrodes. Not only can these touch panels be operated using a fingertip or a pen, they also allow for user input when gloves are being worn. In addition to standard single-point input models, we are also able to provide multi-point input types. Standard type Specification Standard High heat-resistant Decoration Voltage (V) Size (inch) 2 to 15 2 to to 7.0 Operating temp. range ( ) 20 to to to 70 Storage temp. range ( ) 30 to to to 80 Input method Pen or finger Pen or finger Pen or finger Operation force (N) 0.1 to to to 1.5 Linearity (%) ±1.5 ±1.5 ±1.5 to 3.0 Transparency (%) 75 to to max. Reflectance (%) 8 to to to 23 Haze (%) 1 to 12 1 to 12 0 to 12 l Figures shown are typical. Please contact our sales personnel for specifications. l High transparency, tempered glass and anti-smudge conform to the standard specification. 12

4 Film / glass touch panels l Standard specification / high transparency / tempered glass / anti-smudge / high heat-resistant Features l Various transparency levels are available by combination of the film or glass. lhigh transparency, anti-smudge, tempered glass, high heat-resistant types are optionally available. l Decoration type The decoration sheet is fitted on the surface of the touch panel. This provides a response to the various design demands of users. Film / glass structure Features l A fully flat finishing that is bezel-free is realized. l Drip and Dust proof is possible from the fully flat structure. l The decoration sheet of the surface can be custom made. 13

Resistive Touch Panels SMK provides standard touch panels of various sizes from 5.6 inches to 15 inches.

4 inch Recommended connector number Part number External dim. (mm) Transparent area dim. (mm) Active area dim.

5 Resistive Touch Panels SMK provides standard touch panels of various sizes from 5.6 inches to 15 inches. All standard touch panels use SMK tooling mold, therefore customers are able to save development expenses. A small lot production is also available. Lineup of standard film / glass type 5.6 inch 8.4 inch Recommended connector number Part number External dim. (mm) Transparent area dim. (mm) Active area dim. (mm) Connector tail length (mm) Glass thickness (mm) Touch panel thickness (mm) Transparency (%) Surface treatment Number of Pins Min. quantity Upper contact Lower contact NTX F non-glare 4 CFP F CFP F 100 NTX F non-glare 4 CFP F CFP F 100 Standard lineup of controllers Interface Serial type USB type USB type Part number NZX F NZX F NZX F Supplied voltage (V) 2.7~ ~ ~5.25 Electrical resolution 10bit ( ) 10bit ( ) 10bit ( ) 12bit ( ) Communication system/rate 9600bps USB 2.0(Full-speed) 12Mbps USB 2.0(Full-speed) 12Mbps Command control plug and play (PNP) compatible plug and play (PNP) compatible plug and play (PNP) compatible Sampling rate 133S/s (typ) 125S/s max. 125S/s max. Package configuration 32p QFP(9 9mm) 64p T-QFP(12 12mm) 48p QFN(7 7mm) Corresponding driver Windows 7/8.1 (only 32bit OS is available) Windows 7/8.1 (only 32bit OS is available) Windows 7/8.1 (only 32bit OS is available) Lineup of connector tails Part No. Width (mm) Length (mm) Pitch (mm) Number of pins Material Others TL Polyimide Width(W) TL-2 TL Polyimide Polyimide High heat-resistant Length(L) 14

6 10.4 inch 12.1 inch 15 inch NTX F non-glare 8 CFP F CFP F 100 NTX F non-glare 8 CFP F CFP F 100 NTX F non-glare 8 CFP F CFP F 100 Evaluation kit Touch panel operation is easily checked by simply connecting this kit to your PC. Type Composition Wiring diagram Serial Standard touch panel Control board (NZX F mounted) RS232C cable AC adapter Touch panel cable Driver software Windows 7/8.1 (only 32bit OS is available) PC PC Serial cable Power Switch Touch panel cable AC adapter Touch panel USB Standard touch panel Control board (NZX F / NZX F mounted) USB cable Touch panel cable Driver software Windows 7/8.1 (only 32bit OS is available) PC USB cable Touch panel cable Touch panel 15

Resistive Touch Panels Glass / glass structure A low reflection touch panel with the use of a thin glass plate for the upper electrode realizes a high heat-resistant.

7 Resistive Touch Panels Glass / glass structure A low reflection touch panel with the use of a thin glass plate for the upper electrode realizes a high heat-resistant. Thus, a tough operating temperature range for car navigation systems and outdoor use products can be met. Specification Voltage (V) Size (inch) Operating temp. range ( C) Storage temp. range ( C) Input method Operation force (N) Linearity (%) Transparency (%) Reflectance (%) Haze (%) Specification 2 to to to 95 Finger 0.2 to 2.0 ± to 82 1 to 16 7 to 12 Transparency (%) Reflectance (%) AG Linear polarized Circular polarized Super low reflectance 82 min max Polarized sunglass compliant 70 to 73 6 to 11 l Figures shown are typical. Please contact our sales personnel for specifications. Technical terms Anti-glare (AG) Coating of the rebound ace court dispersion layer on the film surface, to block reflection so it does not go into eyes. Anti-reflection (AR) Polarizer Retardation Apply many layers of dielectric thin films on the surface of hard coated film to prevent reflection. A film which intercepts the light from various direction and only pass through the light from the fixed direction. Placing a polarizer on the touch panel decreases internal reflection. Retardation plate converts linear polarization into circular polarization. Linear polarization Circular polarization Linear polarization is the light that passed through polarizer. Two compounded linear polarization of 90 degrees shifted phase and an oscillating. The reflection can be decreased due to the rotated outgoing light angle pass through a circular polarizer. 16 Circular polarization

8 Glass / glass touch panel l Linear polarized type, reflectance : 9% Principle l Circular polarized type, reflectance : 6.5% Principle l Super low reflection type, reflectance :1% Principle l Polarized sunglasses compliant type, reflectance : 6 to 11% Principle 17

9 Force Feedback (FFB) Touch Panels Allows for haptic feedback feel from touch panel. Mechanism Touch panel vibrates itself by given vibration signals Features 1. Realization of haptic feedback when inputting on a touch panel, by applying "self-vibration technology". 2. Optionally customizable vibration patterns for varied touch feeling. 3. Quickly provide user with expected touch feelings in a short time. 4. Dedicated controller IC available. (Interface : Serial) FFB touch panel circuit Block diagram 18

(for reference) Glass / glass 4.0 to 10.0-30 to 85-40 to 95 70 to 82 0.1 to 2.0 10 min.

10 Specification of touch panels Size (inch) Operating temp. range ( ) Storage temp. range ( ) Transparency (%) Operation force (N) Amplitude (μm) Supplied voltage (V) Film / glass 4.0 to to to to to min.(for reference) Glass / glass 4.0 to to to to to min.(for reference) Specification of controller IC Size (inch) Supplied voltage (V) Supplied voltage (V ) while driving FFB Electricity cosumption (ma) while driving FFB Standly current (μa) Interface IC size (mm) Standard 4.0 to ~400 peak to peak AC Serial(UART) Supply methods Force feedback touch panel Controller IC Circuit module + or 19

Resistive Touch Screens

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